### Abstract

The mechanisms of edge-localized mode (ELM) energy deposition are
studied by means of non-linear magnetohydrodynamic (MHD) simulation of
ELMs. The footprint of the ELM heat flux at the divertor is found to
increase approximately linearly with the total ELM energy loss for
JET-scale plasmas, which is similar to the experimentally observed
broadening of the ELM energy deposition with ELM energy loss. For these
relatively large ELMs, in which conductive losses dominate, the divertor
footprint broadening is due to an increase in the magnetic perturbation
of the ballooning mode with increasing ELM energy loss, which results in
a widening of the homoclinic tangles intersecting the target. The first
results from ELM simulations in the ITER Q = 10 scenario indicate that
on the ITER scale the broadening is similar for conductive and
convective ELMs at least up to an ELM energy loss of 4 MJ. For the
larger conductive-type ELMs the magnetic perturbation and its homoclinic
tangles determine the pattern of the ELM heat flux at the divertor
target similar to the JET-scale results. For the smaller convective
ELMs, the ELM footprint is determined by the radial distance travelled
by plasma filaments expelled by the ELM and the loss of the plasma
energy in the filaments along the magnetic field lines.

Original language | English |
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Pages (from-to) | 123023 |

Journal | Nuclear Fusion |

Volume | 53 |

Issue number | 12 |

DOIs | |

Publication status | Published - 1 Dec 2013 |

Externally published | Yes |

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## Cite this

Huijsmans, G. T. A., & Loarte, A. (2013). Non-linear MHD simulation of ELM energy deposition.

*Nuclear Fusion*,*53*(12), 123023. https://doi.org/10.1088/0029-5515/53/12/123023